@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --text: 64 58.621% 94.314%;
        --subtext1: 152 20.588% 73.333%;
        --subtext0: 160 16.667% 64.706%;
        --overlay1: 182 10.121% 48.431%;
        --surface0: 200 12.245% 19.216%;
        --base: 202 13.58% 15.882%;
        --mantle: 200 13.846% 12.745%;
        --crust: 203 14.815% 10.588%;
        --pink: 316 68% 85.294%;
        --blue: 216 62.105% 81.373%;
    }
    :root {
        --shadow: var(--crust);
        --on-accent: var(--crust);
    }
}

@media (prefers-color-scheme: light) {
    :root {
        color-scheme: light;
        --text: 203 14.815% 10.588%;
        --subtext1: 195 13.333% 29.412%;
        --subtext0: 193 12.299% 36.667%;
        --overlay1: 193 10.843% 51.176%;
        --surface0: 203 22.5% 84.314%;
        --base: 210 33.333% 88.235%;
        --mantle: 209 29.412% 83.333%;
        --crust: 212 29.412% 80%;
        --pink: 318 29.333% 70.588%;
        --blue: 214 25.683% 64.118%;
    }
    :root {
        --shadow: var(--subtext1);
        --on-accent: var(--text);
    }
}

:root {
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --accent: var(--pink);

    --transition-properties:
        margin, grid-template-rows, grid-template-columns, stroke-dasharray,
        stroke-dashoffset, outline-color, outline-offset, color,
        background-color, box-shadow, outline, border-color, border-radius,
        font-weight, opacity, transform, backdrop-filter, text-decoration-color,
        filter, scale, height, left;
    --transition-duration: 0.2s;
    --transition: var(--transition-duration) var(--ease);
}

::-webkit-scrollbar {
    width: 0.5rem;
    height: 6px;
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: hsla(var(--overlay1) / 1);
    border-radius: 3px;
}
::-webkit-scrollbar-track {
    background: transparent;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;

    scrollbar-width: thin;
    scrollbar-color: hsla(var(--overlay1) / 1) transparent;

    -webkit-tap-highlight-color: transparent;
    outline: 2px solid;
    outline-offset: 2px;
    outline-color: hsla(var(--blue) / 0);

    transition-property: var(--transition-properties);
    transition-duration: var(--transition-duration);
    transition-timing-function: var(--ease);
}
*:focus-visible {
    outline-color: hsl(var(--blue));
    z-index: 5;
}
::selection {
    background-color: hsla(var(--overlay1) / 1);
    color: hsl(var(--crust));
}

body {
    color: hsl(var(--text));
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        sans-serif;
    font-weight: 500;
    background-color: hsl(var(--crust));
    font-size: 15px;
    line-height: 1.5;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    font-variation-settings: "ROND" 0;
}

html,
body {
    min-height: 100vh;
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 1rem;
}

main {
    position: relative;
    max-width: 512px;
    width: 100%;
    margin: 0 auto;
    background: hsl(var(--base));
    padding: 0.25rem;
    border-radius: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

h1,
p {
    text-align: center;
}

header {
    padding: 1rem;
    border-radius: 1.75rem 1.75rem 0.5rem 0.5rem;
    background: hsl(var(--mantle));
}

form {
    padding: 1rem;
    border-radius: 0.5rem 0.5rem 1.75rem 1.75rem;
    background: hsl(var(--mantle));
    display: flex;
    flex-direction: column;
    gap: 0.5rem;

    .field {
        display: flex;
        flex-direction: column;
    }

    label {
        font-size: 0.85rem;
        font-weight: 900;
        color: hsl(var(--subtext0));
    }

    input {
        background-color: hsl(var(--surface0));
        border: 1px solid transparent;
        padding: 0.5rem;
        border-radius: 0.5rem;
        margin-left: -0.5rem;
        margin-right: -0.5rem;
        color: hsl(var(--text));
    }

    button {
        position: relative;
        overflow: hidden;
        margin: auto;
        margin-bottom: -0.5rem;
        padding: 0.5rem 1rem;
        background-color: hsla(var(--accent) / 0.9);
        border: 2px solid transparent;
        border-radius: 5rem;
        color: hsl(var(--on-accent));
        font-weight: 900;

        &:hover {
            background-color: hsla(var(--accent) / 1);
            box-shadow: 0 0 0 0.4rem hsla(var(--accent) / 0.12);
        }

        &:active {
            background-color: hsla(var(--accent) / 0.8);
            transform: scale(0.94);
        }

        &:disabled {
            cursor: wait;
            opacity: 0.7;
        }

        .btn-label,
        .btn-state {
            display: inline-block;
        }

        .btn-state {
            position: absolute;
            inset: 50% auto auto 50%;
            opacity: 0;
            transform: translate(-50%, calc(-50% + 5px));
            white-space: nowrap;

            i {
                display: inline-block;
                width: 0.7em;
                height: 0.7em;
                margin-left: 0.15em;
                border: 2px solid currentColor;
                border-right-color: transparent;
                border-radius: 50%;
                vertical-align: -0.05em;
                animation: spin 600ms linear infinite;
            }
        }

        &.is-sending {
            .btn-label {
                opacity: 0;
                transform: translateY(-5px);
            }

            .btn-state {
                opacity: 1;
                transform: translate(-50%, -50%);
            }
        }

        &.is-sent {
            background-color: hsl(var(--accent)) !important;

            .btn-label {
                animation: sent-pop 500ms var(--ease);
            }
        }
    }
}

main {
    .status-box {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding-top: 0.75rem;
        text-align: center;
        visibility: hidden;
        opacity: 0;
        transform: translateY(-3px);

        &.success,
        &.error {
            visibility: visible;
            opacity: 1;
            transform: translateY(0);
        }

        &.dismissing {
            visibility: visible;
            opacity: 0;
            transform: translateY(-3px);
        }

        &.success { color: hsl(var(--accent)); }
        &.error { color: hsl(var(--red)); }
        &.pop { animation: status-pop 320ms var(--ease); }
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}
@keyframes sent-pop {
    50% {
        transform: scale(1.12);
    }
}
@keyframes status-pop {
    50% {
        transform: translateY(0) scale(1.04);
    }
}
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}